Why iron pillar is resistant to corrosion? What is the type of iron used in ancient India?
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it was same which we use nowadays.
scientist also are not able to find it.
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The composition is not homogeneous; the carbon content varies widely, as is the case for other ancient wrought iron. ... As a result, a very thin dark grey protective layer of crystalline iron hydrogen phosphate has formed on the surface of the pillar, which is the reason for its resistance to corrosion
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